+/*
+ * libuci - Library for the Unified Configuration Interface
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * this program is free software; you can redistribute it and/or modify
+ * it under the terms of the gnu lesser general public license version 2.1
+ * as published by the free software foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * This file contains the code for parsing uci config files
+ */
+
+#include <ctype.h>
+
+#define LINEBUF 128
+#define LINEBUF_MAX 4096
+
+/*
+ * Fetch a new line from the input stream and resize buffer if necessary
+ */
+static void uci_getln(struct uci_context *ctx)
+{
+ struct uci_parse_context *pctx = ctx->pctx;
+ char *p;
+ int ofs;
+
+ if (pctx->buf == NULL) {
+ pctx->buf = uci_malloc(ctx, LINEBUF);
+ pctx->bufsz = LINEBUF;
+ }
+
+ ofs = 0;
+ do {
+ p = &pctx->buf[ofs];
+ p[ofs] = 0;
+
+ p = fgets(p, pctx->bufsz - ofs, pctx->file);
+ if (!p || !p[ofs])
+ return;
+
+ ofs += strlen(p);
+ if (pctx->buf[ofs - 1] == '\n') {
+ pctx->line++;
+ pctx->buf[ofs - 1] = 0;
+ return;
+ }
+
+ if (pctx->bufsz > LINEBUF_MAX/2) {
+ pctx->byte = LINEBUF_MAX;
+ UCI_THROW(ctx, UCI_ERR_PARSE);
+ }
+
+ pctx->bufsz *= 2;
+ pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
+ } while (1);
+}
+
+/*
+ * Clean up all extra memory used by the parser
+ */
+static void uci_parse_cleanup(struct uci_context *ctx)
+{
+ struct uci_parse_context *pctx;
+
+ pctx = ctx->pctx;
+ if (!pctx)
+ return;
+
+ if (pctx->buf)
+ free(pctx->buf);
+ if (pctx->file)
+ fclose(pctx->file);
+
+ free(pctx);
+}
+
+static void skip_whitespace(char **str)
+{
+ while (**str && isspace(**str))
+ *str += 1;
+}
+
+static char *parse_double_quote(char **str)
+{
+ char *val;
+
+ *str += 1;
+ val = *str;
+ while (**str) {
+
+ /* skip escaped characters */
+ if (**str == '\\') {
+ *str += 2;
+ continue;
+ }
+
+ /* check for the end of the quoted string */
+ if (**str == '"') {
+ **str = 0;
+ *str += 1;
+ return val;
+ }
+ *str += 1;
+ }
+
+ return NULL;
+}
+
+static char *parse_single_quote(char **str)
+{
+ /* TODO: implement */
+ return NULL;
+}
+
+static char *parse_unquoted(char **str)
+{
+ char *val;
+
+ val = *str;
+
+ while (**str && !isspace(**str))
+ *str += 1;
+ **str = 0;
+ *str += 1;
+
+ return val;
+}
+
+static char *next_arg(char **str)
+{
+ skip_whitespace(str);
+
+ switch (**str) {
+ case '"':
+ return parse_double_quote(str);
+ case '\'':
+ return parse_single_quote(str);
+ case 0:
+ return NULL;
+ default:
+ return parse_unquoted(str);
+ }
+}
+
+static void uci_parse_config(struct uci_context *ctx, char **str)
+{
+ char *type, *name;
+
+ *str += strlen(*str) + 1;
+
+ if (!*str) {
+ ctx->pctx->byte = *str - ctx->pctx->buf;
+ UCI_THROW(ctx, UCI_ERR_PARSE);
+ }
+
+ type = next_arg(str);
+ if (!type) {
+ ctx->pctx->byte = *str - ctx->pctx->buf;
+ UCI_THROW(ctx, UCI_ERR_PARSE);
+ }
+
+ name = next_arg(str);
+ DPRINTF("Section<%s>: %s\n", type, name);
+}
+
+static void uci_parse_option(struct uci_context *ctx, char **str)
+{
+ char *name, *value;
+
+ *str += strlen(*str) + 1;
+
+ name = next_arg(str);
+ if (!name) {
+ ctx->pctx->byte = *str - ctx->pctx->buf;
+ UCI_THROW(ctx, UCI_ERR_PARSE);
+ }
+
+ value = next_arg(str);
+ if (!value) {
+ ctx->pctx->byte = *str - ctx->pctx->buf;
+ UCI_THROW(ctx, UCI_ERR_PARSE);
+ }
+
+ DPRINTF("\tOption: %s=\"%s\"\n", name, value);
+}
+
+static void uci_parse_line(struct uci_context *ctx)
+{
+ struct uci_parse_context *pctx = ctx->pctx;
+ char *word, *brk;
+
+ for (word = strtok_r(pctx->buf, ";", &brk);
+ word;
+ word = strtok_r(NULL, ";", &brk)) {
+
+ char *pbrk;
+ word = strtok_r(word, " \t", &pbrk);
+
+ switch(word[0]) {
+ case 'c':
+ if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
+ uci_parse_config(ctx, &word);
+ break;
+ case 'o':
+ if ((word[1] == 0) || !strcmp(word + 1, "ption"))
+ uci_parse_option(ctx, &word);
+ break;
+ default:
+ pctx->byte = word - pctx->buf;
+ UCI_THROW(ctx, UCI_ERR_PARSE);
+ break;
+ }
+ }
+}
+
+int uci_parse(struct uci_context *ctx, const char *name)
+{
+ struct uci_parse_context *pctx;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, name != NULL);
+
+ /* make sure no memory from previous parse attempts is leaked */
+ uci_parse_cleanup(ctx);
+
+ pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
+ ctx->pctx = pctx;
+
+ /* TODO: use /etc/config/ */
+ pctx->file = fopen(name, "r");
+ if (!pctx->file)
+ UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+
+ while (!feof(pctx->file)) {
+ uci_getln(ctx);
+ if (*(pctx->buf))
+ uci_parse_line(ctx);
+ }
+
+ /* if no error happened, we can get rid of the parser context now */
+ uci_parse_cleanup(ctx);
+
+ return 0;
+}
+
+